CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income	$ 1,992	$ 1,506	$ 10,115
Adjustments to reconcile consolidated net income to net cash flows from operating activities:
Depreciation and amortization	9,926	10,318	10,588
Stock compensation expense	315	285	261
Accelerated vesting of equity awards	0	5	49
Noncash interest income, net	(106)	(307)	(370)
Other pension (benefits) costs, net	69	(192)	(1)
Loss on extinguishment of debt	25	0	40
(Gain) loss on financial instruments, net	54	110	(69)
Deferred income taxes	320	110	(9,116)
Other, net	158	175	16
Changes in operating assets and liabilities, net of effects from acquisitions and dispositions:
Accounts receivable	(505)	(98)	(84)
Prepaid expenses and other assets	(397)	(270)	76
Accounts payable, accrued liabilities and other	(103)	125	449
Net cash flows from operating activities	11,748	11,767	11,954
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(7,195)	(9,125)	(8,681)
Change in accrued expenses related to capital expenditures	55	(470)	820
Real estate investments through variable interest entities	(148)	(21)	(105)
Other, net	(43)	(120)	(132)
Net cash flows from investing activities	(7,331)	(9,736)	(8,098)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	19,685	13,820	25,276
Repayments of long-term debt	(13,309)	(10,769)	(16,507)
Payments for debt issuance costs	(103)	(29)	(111)
Purchase of treasury stock	(6,873)	(4,399)	(11,715)
Proceeds from exercise of stock options	118	69	116
Purchase of noncontrolling interest	(885)	(656)	(1,665)
Distributions to noncontrolling interest	(154)	(153)	(153)
Borrowings for real estate investments through variable interest entities	0	342	0
Distributions to variable interest entities noncontrolling interest	0	(107)	0
Other, net	(112)	(5)	(11)
Net cash flows from financing activities	(1,633)	(1,887)	(4,770)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	2,784	144	(914)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	765	621	1,535
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	3,549	765	621
CASH PAID FOR INTEREST	3,963	3,865	3,421
CASH PAID FOR TAXES	$ 71	$ 45	$ 41